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MAX6640 Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX6640 Datasheet(HTML) 3 Page - Maxim Integrated Products |
3 / 22 page 2-Channel Temperature Monitor with Dual Automatic PWM Fan-Speed Controller _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +5.5V, TA = 0 °C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +85°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DIGITAL INPUTS AND OUTPUTS ALERT, FANFAIL, THERM, OT SDA ISINK = 6mA 0.4 Output Low Voltage (Sink Current) (OT, ALERT, FANFAIL, THERM, SDA, PWM1, and PWM2) VOL PWM1, PWM2, ISINK = 4mA 0.4 V Output High Leakage Current (OT, ALERT, FANFAIL, THERM, SDA, PWM1, and PWM2) IOH 1µA Logic-Low Input Voltage (SDA, SCL, THERM, TACH1, TACH2) VIL 0.8 V VCC = 3.3V 2.1 Logic-High Input Voltage (SDA, SCL, THERM, TACH1, TACH2) VIH VCC = 5.5V 2.6 V Input Leakage Current (SDA, SCL, THERM, TACH1, TACH2) VIN = VCC or GND 1 µA Input Capacitance CIN 5pF SMBus TIMING (Note 2) Serial Clock Frequency fSCL (Note 3) 10 100 kHz Clock Low Period tLOW 10% to 10% 4 µs Clock High Period tHIGH 90% to 90% 4.7 µs Bus Free Time Between Stop and Start Condition tBUF 4.7 µs SMBus Start Condition Setup Time tSU:STA 90% of SMBCLK to 90% of SMBDATA 4.7 µs Start Condition Hold Time tHD:STO 10% of SDA to 10% of SCL 4 µs Stop Condition Setup Time tSU:STO 90% of SCL to 10% of SDA 4 µs Data Setup Time tSU:DAT 10% of SDA to 10% of SCL 250 ns Data Hold Time tHD:DAT 10% of SCL to 10% of SDA (Note 4) 300 ns SMBus Fall Time tF 300 ns SMBus Rise Time tR 1000 ns SMBus Timeout tTIMEOUT 58 74 90 ms Note 1: All parameters tested at a single temperature. Specifications are guaranteed by design. Note 2: Timing specifications guaranteed by design. Note 3: The serial interface resets when SCL is low for more than tTIMEOUT. Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL's falling edge. |
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